Measuring instrument.



No. 894,770; PATENTED JULY 28, 1908.

' I W. M. WOOD.

MEASURING INSTRUMENT. APPLICATION FILED MAY 13, 1907.

- Cullman, in the county of of Alabama, have invented new and useful struments."

To all whom it may concern:

' 1 TED s'rA-rrns PATENT OFFICE.

, WILLIAM M. WOOD, OF GULLMAN, ALABAMA.

MEASURING INSTRUMENT. I

Specification of Letters Patent.

Patented July 28,1908.

Application filed May 18, 1907. Serial No. 373,360.

Be it known that 1, WILLIAM M, Wool), a' citizen of the United States, residing at Improvements Measuring Instruments, of which thefollowing isa specification. "T1118 invent j n relates to measuring in- {The object ail-thefaweaeon is to combine 1 in a measuring nstrument the principles of a i right angles; ,ascertainin squ a d r l i u h manner that the device may beuse'd marking straight and and marking angles. ofya ny' numbei fof, egress; fitting and v marking rafters} braces, and; all diagonal or angular work 'WhZfeinIth angles arecompleknown dimension or one end of a rafter using the markings of the'other-end; ascertaining the shape or angles of roofs and determining other measurements of a similar nature.

. scription-=proceeds,

Withjithe foregoing and other minor objects in view, which will appear as the dethe invention consists in the combination and arrangement of parts constructions hereinafter described and claimed as a practical embodifment thereof.

In the. accompanying drawing, forming partof this specification, Figure 1 is a plan viewof'a measuring instrument constructed fitted attheir' 1 in accordance with the invention; Fig. 2

sponding parts the different views.

'The'improved measuring instrument comiprises, preferably, two arms, 1 and 2,which are integral, or connected together in any suitable-manner and are disposed at a'right angle arithfrespect to each other; a radial armflhaving therein a longitudinal slot 4, intojijwhich said angular arms 1, and 2 are oint of intersection, said radial, and a'ngu ar arms being pivotally connectedwith' each other in any suitable manner; a segmental guidearm 5, formed there- With,:-sa-id angular arms 1 and 2 being the arc of a circle, having the pivot curved on point 6 of the radial arm 3,*as its center, said cur ged guide armdextending through the Culhnan and State is asection taken longitudinally through the radial arm 3.

longitudinal slot 4 of the radial arm 3 and being formed with a continuous longitudinal slot 7, which extends partly across each of the angular arms 1 and 2, as shown at 8; and an adjusting or thumb screw 9 extending through what may be termed a sight slot 10 in the radial arm 3, and

tu'dinal slot 7 in the guide arm 5. The

, length of thesight slot 10, in the radial arm 3, is about equal to the width of the guide arm 5,so as to permit the scale marks on said guide arm to be perceived clearly through said sight slot. One side of the sight slot 10 is disposed upon the radial line 11, extending longitudinally through the center of Each of the arms 1, 2, 3, and

through the longii the 5 is provided on each side with two sets of scale marks, one set indicated clearl series of numera s scale'marks on each side of each arm.

It will be understood from the foregoing that the-arrangement of the scale marks inin Fig. 1, and a single dicated in Fi 1, is duplicated upon the oposite side 0 the measuring instrument, in

order that either side of said instrumentmay be utilized in measuring various lines or angles, as will be apparent to those skilled in the art to which the invention relates.

The improved instrument of this invention is strong, simple, durable, and inexpensive in construction, as Well as thoroughly efiicient in operation. It combines the principles of the square in such manner that various angles 'or'degrees of a circle may be readily ascertained. I

The guide arm 5 has its opposite ends integral with the angular arms 1 and 2 and sa1d ends extend part way into said arms as indicated at 8, and the slot 7 of said guide arm which extends from end to end thereof,

ermits of the radial arm 3 being swung upon its pivot until it entirely incloses one or the other of the angula arms, this action is accomplished by the arm 3' being of a-length longer than the angular arms 1 and 2, and said slot of the radial arm, stops short of its free .end so as to inclol one or the other of the free ends of the said operation being accomplished without the angular arms, this necessity of removing the thumb screw 9 entirely from the sight slot 10 or longitudinal slot 7.

The various methods of using the improved measuring instrument will be apparbeing disposed on each side of the longitudinal center of the arm, as

serving for the two sets of 5 ment of parts, and in its details of construction, the deviceot this invention constitutes for the same pur ose; I

In the use of the improved measuring inan improyementfover prior devices intended strument the radial arm 3, in the slot 4 of which the square formed by the arms 1-2 is pivoted, may be utilized as a straight edge to engage the side of a blank that is to be measured and maked, one or the other arms of the square being placed flat upon the blank to afford a straight edge Where y the desired marking may be made. It will be seen that if for instance the two ends of the rafter are to be marked alike, for cutting off at the same angle, the instrument, after one end has been marked, may be simply reversed and adjusted at the opposite end of the rafter which may then be marked to correspond with the first end. The opposite sides of the improved instrument being graduated or marked in an iden tical manner, it is obvious that the use of said instrument will be greatly facilitated, and the range of its utility lncreased.

.; 3Q Minor changes in the embodiment of in- V enti0n illustrated and described, may be made-within the scope of the following claims, without departing from the spirit of the invention, or sacrificing any of its advantages.

. Havin thusfully described the invention, what is c aimed as new is I The herein described measuring instrument comprising two arms at an angle one to the other, a slotted radial arm having one 4 end pivoted to the intersections of the angular arms, the opposite or free end of the radial arm being unslotted, a curved guide arm having its op osite ends extending part Way into the angu ar arms and havin a continu- 4 ous slot therein which extends rom end to end of the guide arm, said radial arm. having a longitudinal opening therein, a thumb screw connected to said opening and to the slot of the curved arm, said radial arm being 5 constructed of a length longer than said an--' gular arms and serving with the unslotted end thereof to inclose-the bodies and ends of one or'the other of said radial arms, substantially as specified. 5

In testimony whereof, I affix my signature in presence of two witnesses.

WILLIAM M. WOOD.

Witnesses:

J. B. BROWN, 'GAULT CAMPBELL. 

